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When was NAVD 88 renamed?
When will NAVD 88 be replaced?
What is NAVD 88?
What happened to the North American vertical datum of 1988?
NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico. It held fixed the height of the primary tide gauge benchmark , referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value, at Rimouski , Quebec , Canada .
Jul 12, 2018 · The North American Vertical Datum of 1988 (NAVD 88) is the vertical control datum established in 1991 by the minimum-constraint adjustment of the Canadian-Mexican-United States leveling observations.
Nov 4, 2020 · The NAVD 88 used some of the original data from 1929 but also re-leveled about 100,000 km. Originally scheduled to be completed in 1988, it was finished on June 15, 1991. The new datum produced fewer distortions than earlier vertical datums and more accurate elevations, according to Remondi.
Mar 5, 2020 · The vertical control datum established for vertical control surveying in the Unites States of America based upon the General Adjustment of the North American Datum of 1988. It replaces the National Geodetic Vertical Datum (NGVD) of 1929. Last updated March 5, 2020.
Jul 12, 2018 · Therefore, it was renamed in 1973, the National Geodetic Vertical Datum on 1929. ( Geodetic Glossary, pp. 56) The North American Vertical Datum of 1988 (NAVD 88) is the vertical control datum established in 1991 by the minimum-constraint adjustment of the Canadian-Mexican-United States leveling observations.
To perform the new general adjustment, NGS prepared a budget initiative for fiscal-year 1977 to finance this project, a revision of which later was approved. The adjustment project, called the North American Vertical Datum of 1988 (NAVD 88), formally began in October 1977.
NAD 83 and NAVD 88, although still the official horizontal and vertical datums of the National Spatial Reference System (NSRS), have been identified as having shortcomings that are best addressed through defining new horizontal and vertical datums.
